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What is CPU PLL overvoltage?

post #1 of 34
Thread Starter 
Ok, I had a thread up before about how my PC died when I tried waking it from sleep, and how I thought it was to do with my OC of my 2600k.

Someone posted that it had to do with CPU PLL overvoltage and to try some different C states.

I have no idea what any of that is, and was wondering if someone could tell me, and explain how that could have messed up my OC?
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post #2 of 34
Leave it disabled always. What are you trying to reach? 4.0? 4.5?
post #3 of 34
from Sandybridge-E guide from Sin0822
http://www.overclock.net/t/1189242/sandy-bridge-e-overclocking-guide-walk-through-explanations-and-support-for-all-x79-overclockers
I found something relevant to your question:

CPU PLL Voltage Override (Overvoltage): What the Heck does it do?
So I asked that question to an Intel Overclocking Engineer his explanation was roughly: We went through the BIOS settings trying to find setting that if changed could help overclock our CPUs further. We came across this setting. Think of the CPU PLL voltage as a voltage that is provided to the CPU, but then “clipped” down to an approximate voltage. No matter what that input is whether 1.3v or 1.9v it is clipped (hypothetically let’s say 800mv after clipping (he didn’t say how much)) that way other devices can use the PLL voltage and clip to what they need. The CPU PLL Overvoltage allows for less clipping of that voltage. It can also reduce the lifespan of the CPU, but nothing noticeable.

So those of you who think that increasing your PLL voltage will help with that setting, it really doesn’t.
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post #4 of 34
Thread Starter 
Quote:
Originally Posted by overpass View Post

from Sandybridge-E guide from Sin0822
http://www.overclock.net/t/1189242/sandy-bridge-e-overclocking-guide-walk-through-explanations-and-support-for-all-x79-overclockers
I found something relevant to your question:
CPU PLL Voltage Override (Overvoltage): What the Heck does it do?
So I asked that question to an Intel Overclocking Engineer his explanation was roughly: We went through the BIOS settings trying to find setting that if changed could help overclock our CPUs further. We came across this setting. Think of the CPU PLL voltage as a voltage that is provided to the CPU, but then “clipped” down to an approximate voltage. No matter what that input is whether 1.3v or 1.9v it is clipped (hypothetically let’s say 800mv after clipping (he didn’t say how much)) that way other devices can use the PLL voltage and clip to what they need. The CPU PLL Overvoltage allows for less clipping of that voltage. It can also reduce the lifespan of the CPU, but nothing noticeable.
So those of you who think that increasing your PLL voltage will help with that setting, it really doesn’t.

So its ok to just turn it off?
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post #5 of 34
Thread Starter 
Well, I disabled it and put my Cpu up to 4.5Ghz, rather than 4.6 with a voltage of 1.35. So far so good, just tried sleeping and waking a few times, nothing abnormal happens.

Guess I just have to wait and see.

Also, when it did fail on waking, my PC just kept booting to a black screen with the cursor floating around. I'm assuming it was because the boot from sleep cycle got interrupted. Is there anyay to stop it from doing that? Like unplugging the PC for a few minutes and trying again?
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post #6 of 34
It's Voltage Current constant for a phase locked load (vcc/pll).
post #7 of 34
Thread Starter 
I've done some googling and checked out some other threads from here, and from what I can tell, Its better to leave it off, unless Im going for a 47+ multiplier, or if I start getting freezing on startup.

is that fairly accurate?
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post #8 of 34
Quote:
Originally Posted by overpass View Post

from Sandybridge-E guide from Sin0822
http://www.overclock.net/t/1189242/sandy-bridge-e-overclocking-guide-walk-through-explanations-and-support-for-all-x79-overclockers
I found something relevant to your question:

CPU PLL Voltage Override (Overvoltage): What the Heck does it do?
So I asked that question to an Intel Overclocking Engineer his explanation was roughly: We went through the BIOS settings trying to find setting that if changed could help overclock our CPUs further. We came across this setting. Think of the CPU PLL voltage as a voltage that is provided to the CPU, but then “clipped” down to an approximate voltage. No matter what that input is whether 1.3v or 1.9v it is clipped (hypothetically let’s say 800mv after clipping (he didn’t say how much)) that way other devices can use the PLL voltage and clip to what they need. The CPU PLL Overvoltage allows for less clipping of that voltage. It can also reduce the lifespan of the CPU, but nothing noticeable.

So those of you who think that increasing your PLL voltage will help with that setting, it really doesn’t.

Didn't ask him what meant by "other devices"? frown.gif
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post #9 of 34
Quote:
Originally Posted by Ragnarok05 View Post

I've done some googling and checked out some other threads from here, and from what I can tell, Its better to leave it off, unless Im going for a 47+ multiplier, or if I start getting freezing on startup.
is that fairly accurate?

Yes, it actually breaks sleep and hibernate as well so that's why you had trouble sleeping. I left it turned off until I went to 50 multi, I can boot up to 49 multi with it off perfectly stable. smile.gif

Quote:
Originally Posted by samwiches View Post

Didn't ask him what meant by "other devices"? frown.gif

Other devices would be IMC, iGPU, etc.
post #10 of 34
you will need PLL voltage to get past 4.6ghz on most i5 2500k's....is it really a bad thing to have enabled??
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